private XLObjectViewModel(XLObject xlobj, XLObjectViewModel parent)
{
_xlobject = xlobj;
Parent = parent;
Children = new ReadOnlyCollection <XLObjectViewModel>(
(from child in xlobj.Children
select new XLObjectViewModel(child, this))
.ToList());
}
public XLObjectViewModel(XLObject xlobj)
: this(xlobj, null)
{
}